Burglar-alarm.



J. A HBLQUIST. BURGLAR ALARM.

APPLICATION FILED PEB. 19, 1909.

Patented Jan. 11, 1910. v

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UNITED @Il/@IES Ar-IEN'I IPFIME.

JOHN A. HELQUIST, OF BLUE ISLAND, ILLINOIS.

BURGLAR-ALARM.

Application filed February 19, 1909.

To all whom 'tt may concern:

Be it known that I, JOHN A. HELQUls'r, a citizen of the United Stat-es,residing at Blue Island, in t-he county of Cook and State of Illinois,have invented certain new and useful Improvements in Burglari-lrlarms,of which the following` is a specification.

My invention relates to burglar alarms, and the object thereof is toprovide a device of this character which will prevent a person fromsurreptitiously gaining access to a house through a window.

Generally speaking', the invention contemplates the cooperation of apair of devices carried by the upper and lower sash and adapted to causea rapid series of noises sufficient to apprise any inmate of the houseof the proposed entrance of a person through the window, upon themovement of either sash.

To the accomplishment of the recited object and others coordinatetherewith, the preferred embodiment of my invention resides in thatconstruct-ion and arrangement of parts hereinafter described,illust-rated in the accompanying drawings, and embraced within the scopeof the appended claim.

In said drawings: Figure l is a fragmentary perspective view of theupper and lower window sashes and window frame showing the embodiment ofmy invention, and F ig. 2 is a transverse sectional view thereof.

Similar reference characters designate corresponding parts throughoutthe several views.

Referring more particularly to the drawings for a detailed descriptionof my invention, the numeral 5 designates the window frame and 6 and 7,the upper and lower sash, respectively. Disposed vertically with respectto the upper sash is a metallic element 8 provided with denticulationsand having deflected at substantially right angles thereto and atopposite terminals thereof the integrally formed ears 10, which areutilized conjunctively with screws or equivalent fastening means forsecuring the device to the sash.

Specification of Letters Patent.

Patented J an. 11, 1910.

serial No. 478,896.

On the top rail of the lower sash 7 and in juxtaposition to the metallicelement S, I mount an angular bracket ll, the upper end of which isbifurcated, as at l2, to form a receptive space for the piece of spring`steel 13. This spring steel piece 13 extends in the direction of itslength sufficient-ly to engage the longitudinally serrated edge 9 of themetallic element 8, and a slot 14; is provided on the inner side of theupper rail of the lower sash for the passage of said element. Now itwill appear obvious that upon movement of the lower sash 7 the steelspring I3 will frictionally engage the denticulations of the element 8and cause a rapid series of noises, and o-wing particularly to thedisposition of the parts of the device on the window sashes the soundwill be amplified and reverberated and in this manner warn a person inany part of a given house or dwelling upon the window of which thisdevice is used.

It should be understood that in its broader aspects my inventioncomprehends the employment not only of the means described, but ofequivalent means for performing the recited functions.

While the arrangement shown is thought, at the present time, to bepreferable, it is desired to reserve the right to effect suchmodifications and variations thereof as may come fairly within the scopeof the appended claim.

Having thus described my invention, what I claim as new, is

In a burglar alarm, the combination of an element carried by the uppersash and having denticulations, an angular support mounted on the lowersash and having a bifurcated terminal, a spring secured in saidterminal, said spring and element adapted to engage each other and causea series of sounds in quick succession.

In testimony whereof I hereunto affix my signature in presence of twowitnesses.

JOHN A. HELQUIST.

Witnesses GEORGE E. HINMAN, ANDREW MORQUIST.

